conoid

co·noid

(kō'noyd),

1. A conic structure.

2. Part of the apical complex characteristic of the protozoan subphylum, Apicomplexa; seen in sporozoites, merozoites, or other developmental stages of sporozoans, less well developed in the piroplasms (families Babesiidae and Theileriidae). The function of the conoid is unknown, but it is thought to be an organelle of penetration into the host cell, possibly aided by a protrusible form of the conoid.

[G. kōnoeidēs, cone-shaped]

conoid

/co·noid/ (ko´noid) cone-shaped.

co·noid

(kō'noyd)

1. A cone-shaped structure.

2. Part of the apical complex characteristic of the protozoan subphylum Apicomplexa; seen in sporozoites, merozoites, or other developmental stages of sporozoans, less developed in the piroplasms (families Babesiidae and Theileriidae). The function of the conoid is unknown, but it is thought to be an organelle of penetration into the host cell, possibly aided by a protrusible form of the conoid.

Regarded by architectural author Walter Leedy as a 'proto-fan', the tomb canopy of Hugh Lord Despenser (1350) in Tewkesbury Abbey is an early example of the composition of conoid forms and what was to become the geometry of the fan vault.

Trinity Chapel is regarded as the first structural fan vault to be made of jointed masonry following the conoid form.

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